unity 增加顶点数，熟悉mesh的构成

using UnityEngine;using System.Collections.Generic;[RequireComponent(typeof(MeshFilter))]public class DoubleVerticals : MonoBehaviour{Mesh mesh;Vector3[] origVertices;int[] origTrangles;// Use this for initializationvoid Start(){mesh = transform.GetComponent<MeshFilter>().mesh;}// Update is called once per framevoid Update(){if (Input.GetKeyDown("space")){IncreseVertices();}}void IncreseVertices(){if (mesh.vertexCount >= 18432){Debug.Log("Too Many");return;}origVertices = mesh.vertices;origTrangles = mesh.triangles;Dictionary<Vector3, int> verticesResultDic = new Dictionary<Vector3, int>();List<int> tranglesResultList = new List<int>();//计算三角面的个数int k = origTrangles.Length / 3;int index = 0;for (int i = 0; i < k; i++){//取出一个三角面（的顶点）Vector3[] trangle = new Vector3[3] { origVertices[origTrangles[i * 3]], origVertices[origTrangles[i * 3 + 1]], origVertices[origTrangles[i * 3 + 2]] };//通过取三条边的中心点//原来三个顶点，变成六个顶点Vector3[] result = new Vector3[6];Vector3 v01 = (trangle[0] + trangle[1]) * 0.5f;Vector3 v12 = (trangle[1] + trangle[2]) * 0.5f;Vector3 v02 = (trangle[0] + trangle[2]) * 0.5f;if (AddVertices(verticesResultDic, trangle[0], index)) index++;if (AddVertices(verticesResultDic, trangle[1], index)) index++;if (AddVertices(verticesResultDic, trangle[2], index)) index++;if (AddVertices(verticesResultDic, v01, index)) index++;if (AddVertices(verticesResultDic, v12, index)) index++;if (AddVertices(verticesResultDic, v02, index)) index++;// 将原三角面分成新的四个三角面// 注意左手法则，逆时针顺序//三角形数组存储的是顶点在顶点数组中的序号tranglesResultList.Add(verticesResultDic[trangle[0]]);tranglesResultList.Add(verticesResultDic[v01]);tranglesResultList.Add(verticesResultDic[v02]);tranglesResultList.Add(verticesResultDic[v01]);tranglesResultList.Add(verticesResultDic[trangle[1]]);tranglesResultList.Add(verticesResultDic[v12]);tranglesResultList.Add(verticesResultDic[trangle[2]]);tranglesResultList.Add(verticesResultDic[v02]);tranglesResultList.Add(verticesResultDic[v12]);tranglesResultList.Add(verticesResultDic[v02]);tranglesResultList.Add(verticesResultDic[v01]);tranglesResultList.Add(verticesResultDic[v12]);}mesh.vertices = GetReusltVertices(verticesResultDic);mesh.triangles = tranglesResultList.ToArray();mesh.RecalculateBounds();//由于normal没有增加，导致表面看起来不平滑(如果要重新计算normals参考顶点的计算)mesh.RecalculateNormals();}bool AddVertices(Dictionary<Vector3, int> verticesResultDic, Vector3 vertice, int index){if (verticesResultDic.ContainsValue(index) || verticesResultDic.ContainsKey(vertice))return false;verticesResultDic.Add(vertice, index);return true;}Vector3[] GetReusltVertices( Dictionary< Vector3,int> verticesResultDic){int length = verticesResultDic.Keys.Count;Vector3[] result = new Vector3[length];List<Vector3> temp = new List<Vector3>(verticesResultDic.Keys);for (int i = 0; i < length; i++){result[i] = temp[i];}return result;}}